基金Supported by the National Natural Science Foundation of China under Grant No 10671054, the Natural Science Foundation of Hebei Province under Grant Nos 07M006 and F2009000311, and the Key Project of Science and Technology Research of the Ministry of Education of China under Grant No 207011.
基金Supported by the Key Program of the Education Department of Anhui Province under Grant No.KJ2009A048Zthe Program of the Education Department of Anhui Province under Grant No.2006KJ057B+1 种基金Anhui Provincial Natural Science Foundation under Grant No.03042401the Talent Foundation of Anhui University